Multiple Choice
The light reactions of photosynthesis supply the Calvin cycle with which of the following?
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9. Photosynthesis
Light Reactions of Photosynthesis
Multiple Choice
Describe the primary function of the light reactions of photosynthesis.
A
Production of NADPH used in cellular respiration.
B
Use of ATP to make glucose.
C
Conversion of chemical energy to light energy.
D
Production of ATP and NADPH.
Verified step by step guidance1
Begin by understanding the overall process of photosynthesis, which occurs in two main stages: the light reactions and the Calvin cycle. The light reactions take place in the thylakoid membranes of chloroplasts.
Recognize that the primary function of the light reactions is to convert solar energy into chemical energy. This is achieved through the absorption of light by chlorophyll and other pigments.
During the light reactions, water molecules are split in a process known as photolysis, releasing oxygen as a byproduct. This process also generates electrons and protons.
These electrons are transferred through a series of proteins known as the electron transport chain, leading to the production of ATP and NADPH. ATP is generated through a process called photophosphorylation, while NADPH is produced by the reduction of NADP+.
Understand that ATP and NADPH produced in the light reactions are then used in the Calvin cycle to synthesize glucose from carbon dioxide, completing the photosynthesis process.
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